Melt and fluid inclusions from volcanic quartz phenocrysts in the Shila gold / base metal ore district, Peru: precursors to ore-forming epithermal solutions? - BRGM - Bureau de recherches géologiques et minières
Journal Articles Terra Nova Year : 2002

Melt and fluid inclusions from volcanic quartz phenocrysts in the Shila gold / base metal ore district, Peru: precursors to ore-forming epithermal solutions?

Abstract

Despite the close association with volcanic activity, the source of metals and ligands in the epithermal ore deposits is still controversial. In order to explore the magmatic–hydrothermal connection further, silicate melt, saline- and water-rich fluids, and CO2 vapours are documented that are trapped as inclusions in quartz phenocrysts from dacitic dykes associated with epithermal gold/base metal mineralization in the Shila district (Peru). Melt inclusion characteristics, and microthermometric and laser Raman fluid inclusion data are presented. The investigation of melt and fluid inclusions reveals that the volatile phase of magmas might represent the precursors to the early chlorine-rich ore-forming epithermal solutions. Microthermometric investigations in magmatic quartz crystals and data on quartz mineralized veins suggest that the fluid evolution and ore deposition may be the result of several processes including: release of an evolving magmatic fluid, and/or boiling, and/or mixing.

Domains

Earth Sciences

Dates and versions

hal-04122229 , version 1 (08-06-2023)

Identifiers

Cite

Luminita Grancea, Anne-Sylvie André-Mayer, Michel Cuney, Jacques Leroy. Melt and fluid inclusions from volcanic quartz phenocrysts in the Shila gold / base metal ore district, Peru: precursors to ore-forming epithermal solutions?. Terra Nova, 2002, 14 (6), pp.476-483. ⟨10.1046/j.1365-3121.2002.00435.x⟩. ⟨hal-04122229⟩
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